<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../vue.js"></script>

</head>
<body>
   <!-- 这个是是v-on可以省略写成 @， 也就是 v-on:click 和@:click 是一样的  -->
    <div id="app">
        {{count}}
        <button @click="count++">按钮2</button>
    </div>

    <script>
        Vue.config.productionTip = false;
        const vm = new Vue({
            el:'#app',
            data(){
               return {
                    count:20,
                    
                }
            },
        })


    </script>
</body>
</html>